var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');

var indexRouter = require('./routes/index');
var userRouter = require('./routes/user');
var adminRouter = require('./routes/admin');

var app = express();

// 允许跨域，
// 此代码需要在所有路由路径配置之前执行，否则代码之前定义的路由不接受此跨域的头部配置。
app.all('*', function (req, res, next) {
	res.header('Access-Control-Allow-Origin', '*');
	res.header(
		'Access-Control-Allow-Headers',
		'Content-Type, Content-Length,Authorization,Accept, X-Requested-With, yourHeaderFeild'
	);
	res.header('Access-Control-Allow-Methods', 'PUT,POST,GET,DELETE,OPTIONS');
	if (req.method === 'OPTIONS') {
		Response.send(200);
	} else {
		next();
	}
});

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

app.use('/', indexRouter);
app.use('/user', userRouter);
app.use('/admin', adminRouter);

// catch 404 and forward to error handler
app.use(function (req, res, next) {
	next(createError(404));
});

// error handler
app.use(function (err, req, res, next) {
	// set locals, only providing error in development
	res.locals.message = err.message;
	res.locals.error = req.app.get('env') === 'development' ? err : {};

	// render the error page
	res.status(err.status || 500);
	res.render('error');
});

module.exports = app;
